Nyquist limit describes which of the following?

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Multiple Choice

Nyquist limit describes which of the following?

Explanation:
Nyquist limit defines the sampling rate needed to detect the Doppler signal unambiguously. In pulsed Doppler, the highest Doppler frequency you can measure without ambiguity is half the pulse repetition frequency, so the sampling frequency must be at least twice the maximum Doppler shift you expect. If the Doppler shift exceeds this limit, aliasing occurs, causing velocities to be misrepresented or even to appear in the wrong direction. This concept centers on how often you sample in time, not on penetration depth, transmit duration, or the basic method of continuous-wave Doppler.

Nyquist limit defines the sampling rate needed to detect the Doppler signal unambiguously. In pulsed Doppler, the highest Doppler frequency you can measure without ambiguity is half the pulse repetition frequency, so the sampling frequency must be at least twice the maximum Doppler shift you expect. If the Doppler shift exceeds this limit, aliasing occurs, causing velocities to be misrepresented or even to appear in the wrong direction. This concept centers on how often you sample in time, not on penetration depth, transmit duration, or the basic method of continuous-wave Doppler.

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